[PATCH v9 4/9] perf config: Add comparing name treating '_' and '-' as being the same thing.

[Taeung Song <treeze.taeung@gmail.com>]

The comparing name functionality is that
two config name are compared treating '-' or '_' as
being the same thing. For example, both 'print_percent'
and 'print-percent' in 'call-graph' section
are regarded as the same thing.

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/builtin-config.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index f99c39d..d4e2899 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -32,6 +32,27 @@ static struct option config_options[] = {
 	OPT_END()
 };
 
+static int compare_name(const char *name1, const char *name2)
+{
+	while (true) {
+		/*
+		 * If two names have '-' or '_', them are treated
+		 * as being the same thing.
+		 */
+		if ((*name1 == '-' || *name1 == '_')
+		    && (*name2 == '-' || *name2 == '_')) {
+			name1++, name2++;
+			continue;
+		}
+
+		if (*name1 && (*name1 == *name2))
+			name1++, name2++;
+		else
+			break;
+	}
+	return *(const unsigned char *)name1-*(const unsigned char *)name2;
+}
+
 static struct config_section *find_section(struct list_head *sections,
 					   const char *section_name)
 {
@@ -50,7 +71,7 @@ static struct config_element *find_element(const char *name,
 	struct config_element *element;
 
 	list_for_each_entry(element, &section->element_head, list)
-		if (!strcmp(element->name, name))
+		if (!compare_name(element->name, name))
 			return element;
 
 	return NULL;
-- 
1.9.1